산업폐기물 활용 광물탄산화를 통한 폐기물매립시설의 CO2 저감 가능성 평가
Evaluation of the Availability of CO2 Reduction in a Landfill by Mineral Carbonation Using Industrial By-products
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초록
본 연구에서는 산업부산물의 광물탄산화 반응을 통해 폐기물매립시설로부터 발생되는 CO2 가스를 저감시키기 위한 가능성을 평가하였다. 본 연구의 목적은 첫째, 알칼리토금속을 함유하는 산업부산물의 CO2 저감 평가 및수분함량에 의한 저감능력을 평가하는 것이다. 둘째, 각각의 산업부산물의 CO2 저감 능력을 비교하는 것이다. 셋째, CO2 저감의 화학적 반응을 확인하기 위해 화합물원소 분석과 열중량분석(DSC-TGA)을 수행하는 것이다. 매립시설환경을 모사한 30°C의 조건에서의 DSC-TGA 열중량 분석 결과, CO2 저감량이 2.84 wt%로, 즉 1kg의 고화슬러지는28.4g의 CO2를 저감할 수 있는 것으로 나타났다.
Abstract
This study aimed to evaluate the availability of mineral carbonation using industrial by-products, that are capable of reducing the amount of CO2 in gas generated from solid waste landfills. With this objective, we first investigated the reduction of CO2 obtained using different types of industrial waste containing alkaline earth metals, as well as the effect of water on this process. Second, we compared the CO2 reductions obtained using these types of industrial waste. Third, elemental composition and DSC–TGA analyses were carried out to investigate the chemical reactions linked to CO2 reduction. The reduction of CO2 hardly occurred at 30°C (a temperature that simulated the landfill environment). The DSC–TGA thermogravimetric analysis demonstrated the occurrence of weight loss over the temperature range of carbonate mineral decomposition; moreover, the total amount of CO2 was 2.84 wt%, corresponding to 28.4 g CO2/kg of solidified sludge. Overall, these data confirmed the occurrence of CO2 reduction as a result of mineral carbonation.
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